Mental Math
10 + 3 =?
3
Sally's ribbon is 32 inches long. Ava's ribbon is 14 inches long. Who's ribbon is longer? How much longer?
Include a number model
Sally's ribbon is longer. Her ribbon is 18 inches longer than Ava's.
32-14=?
14+?=32
31+27=?
INCLUDE A BALLPARK ESTIMATE.
31+27=58
Ballpark Estimate: 30+30=60, 30+25=55
8+5=?
13
Barb had 16 shells from the beach. She found 7 more. How many shells does Barb have now?
Include a number model.
16+7=?
Barb has 23 shells.
34+41=?
Include a ballpark estimate
34+41= 75
BE: 30+40=70
7+6=?
13
Tom had 28 baseball cards. He got 3 from Jim. Then he gave 5 to his friend Bob. How many baseball cards does Tom have now?
Include number model(s).
28+3= 31
31-5= 26
or
28+3-5= 26
Tom has 26 baseball cards now.
47+29=?
47+29=76
9+6=?
15
Sarah is playing a board game with her sister. On her first turn, she earned 25 points. On her second turn, she lost 5 points. On her third turn she earned 14 points. How many points does she have now?
Include number model(s).
25-5=20
20+14=34
or
25-5+14=?
She has 34 points now.
152+234=?
152+234=386
100+200=300
50+30=80
2+4=6
300+80+6
6+5=?
11
Olivia has 18 colorful pens. She gave 3 pens to Ziva. Then Olivia got 7 pens from Maizy. How many pens does Olivia have now?
Include number model(s).
18-3=15
15+7=22
or 18-3+7=22
Olivia now has 22 pens.
189+298=?
189+298= 487
100+200=300
80+90=170
9+8=17
300+170+17=487